django.utils.timezone.utc import not removed when unused

[shaib]

Python Version

3.12.8

Django Version

stable/5.2.x

Package Version

1.22.2

Description

Just found out ("the hard way", which wasn't that hard) that the utils_timezone fixer did not fix a migration when it imported utc from django.utils.timezone but never used it. The change is still necessary, because the failing import breaks the migration.

I'd like to add a test along the lines of

def test_unused_import():
    check_transformed(
        """\
        import datetime
        from django.utils.timezone import utc
        do_a_thing()
        """,
        """\
        import datetime
        do_a_thing()
        """,
    )

(I haven't yet verified that this test fails, but I have verified it isn't there currently...)